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https://issues.apache.org/jira/browse/CALCITE-3005?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16859664#comment-16859664
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Danny Chan commented on CALCITE-3005:
-------------------------------------
An compile warning of JavaCC throws:
{code:java}
Warning: Choice conflict involving two expansions at
line 6350, column 13 and line 6353, column 13 respectively.
A common prefix is: "LEFT"
Consider using a lookahead of 2 for earlier expansion.
{code}
We need to fix this.
> Implement string functions: LEFT, RIGHT
> ---------------------------------------
>
> Key: CALCITE-3005
> URL: https://issues.apache.org/jira/browse/CALCITE-3005
> Project: Calcite
> Issue Type: New Feature
> Reporter: Forward Xu
> Assignee: Forward Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.20.0
>
> Time Spent: 6h 50m
> Remaining Estimate: 0h
>
> Some string functions including LEFT, RIGHT are not implemented now. It would
> be great if these functions can be implemented.
> [{{LEFT(_str_}},_{{len}}_)|https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_left]
> Returns the leftmost _{{len}}_ characters from the string _{{str}}_, or
> {{NULL}} if any argument is {{NULL}}.
> [{{RIGHT(_str_}},_{{len}}_)|https://dev.mysql.com/doc/refman/8.0/en/string-functions.html#function_right]
> Returns the rightmost _{{len}}_ characters from the string _{{str}}_, or
> {{NULL}} if any argument is {{NULL}}.
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